A．since
B．as
C．when
D．until
请帮忙给出正确答案和分析，谢谢！
【C12】A．SinceB．AsC．WhileD．What
【C5】A．SinceB．AsC．ThereforeD．Although
【C8】A．SinceB．AsC．IfD．Though
He has been studying in the library every night ______the last three months.A．sinceB．until
【C4】A．beforeB．asC．whenD．while
【C4】A．sinceB．asC．soD．thus
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